How secure is the encryption?

We use AES-256 encryption, the same standard used by banks and governments.

Protect PDF with Password Online Free

FreePrivateInstant

Click to upload or drag and drop

PDF file only (max 50MB)

Tips for better compression:

• PDFs with images compress better than text-only documents
• Higher compression may reduce image quality
• Use "Medium" for most documents
• Use "Extreme" for email attachments

Add password to PDF

Quick Links

Protect PDF Password Protect PDF Online Encrypt PDF Online Free Secure PDF Online Lock PDF with Password

What is Protect PDF?

Add password protection to PDF files. Secure your documents with encryption. Our free online tool makes it easy to add password to pdf without installing any software. Simply use your browser to get started instantly.

Features

Password protection

Strong encryption

Restrict editing

Restrict printing

Secure processing

How to Use Protect PDF

1Upload PDF
2Set password
3Choose restrictions
4Download protected PDF

Why Use Our Protect PDF?

Fast & Free

Instant results with no signup or payment required.

Secure & Private

All processing happens in your browser. We never store your files.

No Installation

Works on any device with a web browser. No software needed.

Frequently Asked Questions

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